These easy Slow Cooker Steak Tacos are a great dinner that you can set and forget using your crockpot. Simply combine sirloin steak, seasonings, peppers, and onions for a tender beef taco that’s tortilla-ready. Great for weeknight dinners and delicious leftovers!
Cut your beef sirloin into 2 inch strips. Sprinkle garlic powder on top of them, rubbing it in.
In a skillet over medium high heat, add vegetable oil and beef strips. Brown sirloin strips (takes about 10 minutes), drain grease and set aside.
Add beef broth and cornstarch to the bottom of the slow cooker and mix so cornstarch is dissolved. You want your beef broth to be hot so the cornstarch is dissolved, I throw mine in the microwave for 30 seconds.
Add beef strips into the slow cooker on top of broth mixture.
Add onion, diced tomatoes, cumin, chili powder and salt into the slow cooker mixing to combine all ingredients.
Cover and cook on HIGH for 2 hours, 30 minutes. Add sliced green peppers and cook an additional 1 hour on HIGH. So the total time is 3 hours, 30 minutes.
Serve on tortillas or hard shells, add cheese, salsa, lettuce, avocado or whatever else you'd like on top.